JP5034626B2 - Recording apparatus and liquid ejecting apparatus - Google Patents

Description

  The present invention relates to a recording apparatus and a liquid ejecting apparatus. More specifically, the present invention relates to a recording apparatus and a liquid ejecting apparatus that include a carriage that moves by mounting a recording head that ejects ink onto a recording material, and a guide shaft that guides the moving direction of the carriage.

  There is a recording apparatus that includes a transport unit that transports a recording medium in a specific transport direction and a carriage that reciprocates in a direction crossing the transport direction, and a recording head that ejects ink is mounted on the carriage. That is, an image can be formed on the entire surface of the recording medium by combining the conveyance of the recording medium by the conveyance unit and the reciprocating movement of the carriage. In this type of recording apparatus, it is possible to accurately grasp the position of the recording head with respect to the recording medium and improve the accuracy of the recorded image by accurately moving the recording head.

  Patent Document 1 below describes a printer including a scale plate arranged in parallel with a moving direction of a carriage and a linear encoder that moves along with the carriage and reads a scale of the scale plate. In such a structure, the position of the carriage can be accurately detected by using a scale plate having fine scales and a linear encoder with high resolution.

  Japanese Patent Application Laid-Open No. 2004-228561 describes that in a printer apparatus that also includes a linear encoder, the carriage motor is controlled with reference to carriage position information detected by the linear encoder. Thereby, accurate control can be performed without the influence of the load fluctuation of the motor.

Further, Patent Document 3 below describes that a printer equipped with a linear encoder is attached while energizing the scale via a scale holder. Thereby, positioning of the scale with respect to the frame becomes accurate, and the linear encoder can be used stably.
Japanese Patent Laid-Open No. 05-077514 JP 05-338308 A JP 2000-296649 A

  However, the structure in which the linear scale and the linear encoder are combined has a large number of parts, and the load on the assembly cost in addition to the part cost is large. Further, since the linear encoder must be arranged so as to elastically support the linear scale or not to come into contact with the linear scale, it has become one of the causes that make it difficult to reduce the size of the recording apparatus. Therefore, there is a demand for a recording apparatus carriage structure that can accurately detect the carriage position without using a linear scale and a linear encoder.

  For the purpose of solving the above problems, as a first aspect of the present invention, a transport unit that transports a recording medium and a direction that has ferromagnetic or paramagnetic properties and the transport unit transports the recording medium. A guide member that includes a guide member that extends in a crossing direction, a recording head that ejects ink, a magnetic source that generates a magnetic force that attracts the guide member, and a magnetic sensor that detects a magnetic field generated by the magnetic source. And a carriage that reciprocates along the guide member while being biased toward the recording medium, and the recording medium is fed onto the surface of the recording medium by feeding the recording medium onto the track of the ink ejected by the recording head. The guide member generates a periodic magnetic flux density distribution along the direction of reciprocation of the carriage based on the magnetic force lines from the magnetic force source, and the magnetic sensor Recording apparatus for detecting the amount of movement of the carriage is provided by detecting a change in magnetic flux density distribution along with the movement of the ridge. As a result, the movement amount of the carriage can be detected using the guide member itself as a scale without separately mounting a linear scale or the like. While urging the guide member with magnetic force, the amount of movement of the carriage is detected using the generated magnetic field, that is, two roles can be simultaneously performed by one magnetic force source, so that the number of parts of the recording apparatus can be reduced, The manufacturing process can also be reduced, which can contribute to cost reduction of the recording apparatus.

  In the recording apparatus, the magnetic force source may be a permanent magnet. Thereby, the recording apparatus can be formed with a simple structure.

  Furthermore, in the recording apparatus, the magnetic force source and the magnetic sensor may be arranged with a guide member interposed therebetween. Thereby, the magnetic flux density distribution generated by the guide member can be detected efficiently and accurately.

  Still further, in the recording apparatus, the guide member has irregularities formed periodically along the direction of reciprocal movement of the carriage. Thereby, a periodic magnetic flux density distribution can be formed by processing the guide member into a specific shape.

  Still further, in the recording apparatus, the unevenness may be formed in a region where a contact pressure between the carriage and the guide member is small on a surface where the carriage and the guide member face each other. As a result, it is possible to prevent the sliding resistance of the guide member and the carriage from increasing due to the unevenness formed on the guide member.

  Furthermore, in the recording apparatus, the guide member may include a member that has a different magnetic property from the ferromagnetic material or paramagnetic material forming the guide member and fills the concave portion of the concave and convex portions. Thereby, a smooth shape can be given to a guide member, maintaining the function which forms magnetic flux density distribution.

  Furthermore, in the recording apparatus, the magnetic flux density distribution forms an asymmetric magnetic flux density distribution with respect to the direction of reciprocation of the carriage, and the magnetic field detected by the magnetic sensor changes as the carriage moves. The moving direction may be detected. Thereby, in addition to the movement amount of the carriage, the movement direction of the carriage can also be detected.

  In the recording apparatus, the guide member forms a symmetrical magnetic flux density distribution with respect to the carriage reciprocating direction, and the magnetic sensor has a magnetic flux density distribution period or an integral multiple of the period with respect to the carriage reciprocating direction. May include two or more magnetic detection elements arranged at different intervals, and the moving direction of the carriage may be detected based on the fact that the magnetic field detected by the magnetic sensor changes as the carriage moves. In this case as well, the movement direction of the carriage can be detected in addition to the movement amount of the carriage.

  According to a second aspect of the present invention, a conveyance unit that conveys a recording medium and a ferromagnetic or paramagnetic material that extends in a direction intersecting the direction in which the conveyance medium conveys the recording medium. And a magnetic jet head for jetting liquid, a magnetic source for generating a magnetic force for attracting the guide member, and a magnetic sensor for detecting the magnetic field generated by the magnetic source, and urging the guide member toward the guide member And a carriage that reciprocates along the guide member, and the recording medium is fed onto the track of the liquid ejected by the liquid ejecting head, so that the liquid adheres to the surface of the recording medium and the image is recorded. In the liquid ejecting apparatus to be formed, the guide member generates a periodic magnetic flux density distribution along the direction of the reciprocating movement of the carriage based on the magnetic force lines from the magnetic force source, and the magnetic sensor moves with the movement of the carriage. The liquid ejecting apparatus is provided for detecting the amount of movement of the carriage by detecting a change in magnetic flux density distribution. Thereby, the above-described effect can be enjoyed also in the liquid ejecting apparatus.

  It should be noted that the above summary of the invention does not enumerate all the necessary features of the present invention. Further, a sub-combination of these feature groups can be an invention.

  Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention.

  FIG. 1 is a perspective view showing an appearance of an ink jet recording apparatus 100 according to one embodiment. As shown in the figure, the ink jet recording apparatus 100 is entirely covered with a housing 101. An operation unit 110 is disposed on the front side of the upper surface of the housing 101, and a memory card slot unit 120 is disposed on the side surface of the front surface. Further, a feeding unit 130 is disposed on the back surface of the housing 101, and a discharge unit 140 is disposed on the front surface.

  The operation unit 110 includes a rectangular operation panel 111. A liquid crystal panel 112 that displays an operation state or the like is disposed at a substantially central portion of the operation panel 111. On both sides of the liquid crystal panel 112, there are a power system for turning the power on and off, and an operation system for selecting and executing the operation menu displayed on the liquid crystal panel 112, such as displaying various operation menus on the liquid crystal panel 112. A button 113 is arranged.

  The memory card slot 120 is covered with a cover 121 that can be opened and closed in the direction indicated by arrow a in the figure. The memory card slot unit 120 includes a slot unit in which slots corresponding to a plurality of types of memory cards are formed, for example.

  The feeding unit 130 includes a paper support 132. The paper support 132 has a function of opening and closing a paper feed port 131 that opens upward, and a function of supporting one or more sheets to be fed. Further, the paper support 132 is attached so as to be rotatable in a direction indicated by an arrow b in the drawing around the rotation axis at the rear end. The user inserts his / her finger into a hole 133 provided in the housing 101 of the paper support 132 and opens / closes the paper support 132 with the left side of the paper support 132 shown in the figure.

  FIG. 2 is a perspective view showing the internal structure of the ink jet recording apparatus 100. As shown in the figure, a transport unit 150, a recording unit 160, a platen 170, and a disk transport unit 155 are disposed in front of a carriage frame that stands up along the back surface of the housing 101 over substantially the entire width.

  The paper support 132 includes a support body 31 and a support extension 32 that support the back side of the paper, and a fixed edge guide 33 and a movable edge guide 34 that guide both side edges of the paper. The fixed edge guide 33 is formed integrally with the hopper 51. On the other hand, the movable edge guide 34 moves in a direction orthogonal to the paper feeding direction. The fixed edge guide 33 and the movable edge guide 34 guide both side edges of the sheet. Thus, when the ink jet recording apparatus 100 is used, various sizes of paper are reliably supported.

  Further, the support body 31 formed in a flat plate shape rotates in the direction indicated by the arrow b in the drawing with the rotation axis at the rear end as the center. The support extension 32 formed in a flat plate shape is disposed in the support body 31 so as to be retractable or retractable. Further, when the ink jet recording apparatus 100 is not used, the support extension 32 is stored in the support main body 31 and the support main body 31 is put on the paper feed port 131, so that the size becomes compact.

  The discharge unit 140 includes a discharge tray 142. The discharge tray 142 has a function of opening and closing a paper discharge port 141 that is opened in a rectangular shape toward the front, and a function of stacking one or a plurality of discharged sheets. The discharge tray 142 rotates in the direction indicated by the arrow c in the drawing around the rotation axis at the lower end.

  The user opens and closes the discharge tray 142 by placing a finger on a handle 143 (see FIG. 1) provided on the upper portion of the discharge tray 142. Accordingly, when the ink jet recording apparatus 100 is used, the discharge tray 142 is opened, and when the ink jet recording apparatus 100 is not used, the discharge tray 142 is closed. Thereby, it is possible to prevent dust from entering the discharge port 141. Further, since the recorded paper is discharged to the front surface, the user can easily take out the paper.

  Further, the discharge tray 142 includes a stacker body 41 and a stacker extension 42. The stacker body 41 is formed in a flat plate shape, and rotates in the direction indicated by the arrow c in the drawing around the rotation axis at the rear end. The stacker extension 42 is formed in a flat plate shape and can be stored or pulled out of the stacker body 41. Thereby, when using the inkjet recording apparatus 100, paper of various sizes can be supported. When the ink jet recording apparatus 100 is not used, the stacker extension 42 is stored in the stacker main body 41 and the stacker main body 41 is placed on the paper discharge outlet 141, so that it can be stored compactly.

  FIG. 3 is a longitudinal sectional view showing the internal structure of the ink jet recording apparatus 100. As shown in the figure, the conveyance unit 150 is disposed between the feeding unit 130 and the discharge unit 140. The ink jet recording apparatus 100 includes an automatic paper feed mechanism 151, a transport mechanism 152, and a paper discharge mechanism 153.

  The automatic paper feed mechanism 151 overlaps the hopper 51 that lifts up the paper supported by the paper support 132, the feed roller 52 that picks up the paper lifted by the hopper 51, and the feed roller 52. A retard roller 53 that separates the separated paper into a single sheet and a paper return lever 54 that returns the remaining paper separated by the retard roller 53 to the hopper 51 are provided.

  The hopper 51 is formed in a flat plate shape so that a sheet can be placed, and the lower end is disposed in the vicinity of the feeding roller 52. The feeding roller 52 is formed in a D shape with a part of a cross section cut out, and is disposed near the lower end of the hopper 51.

  The feeding roller 52 intermittently rotates and conveys the sheet lifted by the hopper 51 by friction. The retard roller 53 is disposed so as to contact the feeding roller 52, and when the sheets are overlapped and fed by the feeding roller 52, only the uppermost sheet is frictionally separated from the lower layer sheet. The paper return lever 54 disposed in the vicinity of the feeding roller 52 has a claw-like shape and hooks the lower layer paper separated by the retard roller 53 and returns it to the hopper 51.

  The transport mechanism 152 includes a transport roller 55 and a transport driven roller 56 that feed paper in the transport direction in synchronization with the recording operation. The transport roller 55 is disposed upstream of the platen 170 in the paper transport direction. The transport roller 55 and the transport driven roller 56 sandwich the paper transported by the feeding roller 52 and feed it toward the paper transport direction toward the platen 170.

  The paper discharge mechanism 153 includes a discharge roller 57, a discharge auxiliary roller 58, and a discharge driven roller 59. The discharge auxiliary roller 58 is disposed downstream of the platen 170 in the paper transport direction. The discharge driven roller 59 and the discharge roller 57 are disposed opposite to each other on the downstream side in the paper transport direction from the discharge auxiliary roller 58. The paper that has passed through the platen 170 is first guided by the discharge auxiliary roller 58, and is then sandwiched between the discharge driven roller 59 and the discharge roller 57 and sent out onto the discharge tray 142.

  The recording unit 160 includes a carriage 161 that reciprocates in a direction orthogonal to the sheet conveyance direction in synchronization with the recording operation, and a guide shaft that extends along the reciprocation direction of the carriage 161 and guides the carriage 161 during the reciprocation. 164 and a platen 170 that holds the paper flat during recording.

  The carriage 161 is equipped with a recording head 162 that ejects ink in synchronization with the recording operation. The carriage 161 is coupled to the carriage belt 165 and is driven by a carriage motor (not shown) to reciprocate.

  A cartridge holder 61 is formed inside the carriage 161, and detachably accommodates one or a plurality of ink cartridges. Furthermore, the carriage 161 has a through-hole 163. The carriage guide shaft 164 is inserted through the penetration portion 163.

  The guide shaft 164 has a substantially cylindrical shape and is arranged in parallel with the upper surface of the platen 170. The carriage guide shaft 164 is at least partially formed of a ferromagnetic material such as iron or a paramagnetic material.

  The recording head 162 includes, for example, a black ink recording head that discharges black ink, and a plurality of color ink recording heads that respectively discharge five colors of yellow, cyan, light cyan, magenta, and light magenta. The recording head 162 has a pressure generation chamber and a nozzle opening connected to the pressure generation chamber provided in the nozzle plate. The size is controlled from the nozzle opening toward the paper by storing ink in the pressure generation chamber and pressurizing it with a predetermined pressure. Ink droplets are ejected.

  The above-described ink jet recording apparatus 100 includes, for example, business cards, cards, L / 2L sizes, postcards, six-cut sheets, paper sheets such as JIS standard A6 sizes to A4 sizes, and CD-R ( An image can be recorded on a recording material including a label surface of an optical disk such as a Compact Disc-Recordable (DVD) or a DVD-R (Digital Versatile Disk-Recordable).

  FIG. 4 is a schematic diagram illustrating a state in which the vicinity of the recording unit 160 is viewed from the side surface direction. As shown in the figure, the guide shaft 164 is slidably mounted with a slight gap with respect to the through-hole 163 of the carriage 161. The carriage 161 has a sliding member 166 on the same surface as the surface on which the recording head 162 is mounted. The sliding member 166 contacts the frame 180 that is stretched along the width direction of the ink jet recording apparatus 100 (reciprocating direction of the carriage 161).

  The sliding member 166 slides with respect to the frame 180 when the carriage 161 reciprocates. At least a part of the frame 180 in the reciprocating direction of the carriage 161 is formed of a ferromagnetic material such as iron. With such a structure, the carriage 161 can maintain a stable posture without falling around the guide shaft 164 due to its own weight.

  FIG. 5 is an enlarged schematic view of the vicinity of the sliding member 166 of the carriage 161. As shown in the figure, the sliding member 166 of the carriage 161 has a magnet 202 mounted therein. In addition, the frame 180 that comes into contact with the sliding member 166 is formed of at least a part of the carriage 161 in the reciprocating direction of the carriage 161 from a ferromagnetic material such as iron. Therefore, a magnetic force is generated between the magnet 202 and the frame 180 in the vertical direction indicated by the arrow “F2” in the drawing. Further, gravity acts on the carriage 161 in the vertical direction by its own weight.

  In this way, the carriage 161 is pressed against the frame 180 via the sliding member 166. Further, a state in which a part of the sliding member 166 and a part of the frame 180 are slidably contacted is always maintained. Thereby, rattling between the frame 180 and the carriage 161 can be suppressed.

  In addition, it is preferable that the carriage 161 is disposed at a location where a larger magnetic force can be generated in the direction in which the carriage 161 is pressed against the frame 180. Further, the magnet 202 may be disposed not inside the sliding member 166 but inside the carriage 161, for example.

  FIG. 6 is a schematic view of a cross section obtained by horizontally cutting the carriage 161 along the plane including the line ab shown in FIG. 4 as viewed from above. As shown in the figure, the penetration part 163 of the carriage 161 has a magnet 200 and a yoke 210 therein.

  The magnet 200 is disposed in the center of the inside of the penetration part 163 so as to face the outer surface of the carriage guide shaft 164. Further, the magnet 200 is arranged at a certain distance from the carriage guide shaft 164 in a direction orthogonal to the reciprocating direction of the carriage 161. On the other hand, the yoke 210 has a shape extending from the magnet 200 to the periphery, and is disposed opposite to the outer surface of the carriage guide shaft 164 in the same manner as the magnet 200. Further, both ends of the yoke 210 are separated from the outer peripheral surface of the carriage guide shaft 164 by a minute distance in a direction perpendicular to the reciprocating direction of the carriage 161.

  The yoke 210 is formed of a ferromagnetic material such as iron and is magnetized by the magnet 200. The penetrating part 163, the magnet 200, and the yoke 210 are fixed to each other by a fixing member such as an adhesive or a screw. With such a structure, an attractive force is generated between the magnet 200 and the carriage guide shaft 164 by the magnetic force indicated by the arrow F1 in the drawing.

  Moreover, the magnet 200 and the yoke 210 have a symmetrical shape with respect to the horizontal plane. Accordingly, the resultant magnetic force generated between the magnet 200 and the yoke 210 and the carriage guide shaft 164 acts in the horizontal direction. Further, gravity due to its own weight also acts on the carriage 161. Thereby, the carriage 161 is pressed against the carriage guide shaft 164 by the resultant force of magnetic force and gravity. Further, sliding is performed in a state where a part of the inner peripheral surface of the penetrating part 163 and a part of the outer peripheral surface of the carriage guide shaft 164 are always in contact with each other.

FIG. 7 is an enlarged schematic view of the vicinity of the penetration portion 163 in a cross section obtained by cutting the carriage 161 vertically. As shown in the figure, the penetrating part 163 of the carriage 161 has a magnet 200, a yoke 210, and a magnetic sensor 169 therein. The penetration part 163, the magnet 200, the yoke 210 and the magnetic sensor 169 are fixed to each other by a fixing member such as an adhesive or a screw.

  The magnet 200 is arranged in the center of the inside of the penetration part 163 so as to face the outer surface of the guide shaft 164 and has a shape along the outer shape of the guide shaft 164 which is a columnar shape. Further, the magnet 200 is disposed at a certain distance from the guide shaft 164 in a direction orthogonal to the reciprocating direction of the carriage 161. As the magnet 200, for example, a paramagnetic material such as a permanent magnet or an electromagnet is used.

  The yoke 210 has a shape extending from the magnet 200 to the periphery, and is disposed opposite to the outer surface of the guide shaft 164 in the same manner as the magnet 200. Further, both ends of the yoke 210 have a shape along the outer shape of the guide shaft 164 and are separated from the outer peripheral surface of the guide shaft 164 by a minute distance in a direction orthogonal to the reciprocating direction of the carriage 161. The yoke 210 is made of a ferromagnetic material such as iron, and is magnetized by the magnet 200.

  The magnetic sensor 169 is disposed at a position facing the magnet 200 with the guide shaft 164 interposed therebetween. The magnetic sensor 169 includes, for example, a magnetic detection element such as a Hall effect element, an MR element, an MI element, or a fluxgate element.

  With such a structure, an attractive force indicated by an arrow F1 in the figure is generated between the magnet 200 and the guide shaft 164 by the magnetic force generated by the magnet. Here, as shown in FIG. 6, the magnet 200 and the yoke 210 have a symmetrical shape with respect to the horizontal plane. Therefore, the resultant magnetic force generated between the magnet 200 and the yoke 210 and the guide shaft 164 acts in the horizontal direction.

  Further, the gravity acts on the carriage 161 in the vertical direction by its own weight. Therefore, the carriage 161 is pressed against the guide shaft 164 by the combined force of the magnetic force and the gravity, and a part of the inner peripheral surface of the penetration part 163 and a part of the outer peripheral surface of the guide shaft 164 can slide. The state of being always in contact with is maintained.

  Furthermore, the magnetic sensor 169 detects the magnetic flux density of the magnetic circuit formed by the magnet 200, the yoke 210, and the guide shaft 164 in the immediate vicinity thereof. A recess 167 described later is formed in a region facing the magnetic sensor 169 on the surface of the guide shaft 164. Since the carriage 161 is pressed against the guide shaft 164 by the resultant force of magnetic force and gravity, a gap between the guide shaft 164 and the penetration portion 163 is increased on the lower and right sides in the drawing on the surface of the guide shaft 164 carriage. Therefore, the presence of the recess 167 does not increase the sliding resistance of the penetration part 163 with respect to the guide shaft 164.

  As described above, the ink jet recording apparatus 100 presses the carriage 161 against the carriage guide shaft 164 by the magnetic force generated between the magnet 200 and the yoke 210 mounted on the carriage 161 and the guide shaft 164. Thereby, rattling between the carriage 161 and the carriage guide shaft 164 can be suppressed.

  FIG. 8 is a diagram illustrating one mode of the magnetic sensor 169 and explaining its operation. As shown in the figure, the magnet 200 and the magnetic sensor 169 are arranged with the guide shaft 164 interposed therebetween. As the carriage 161 reciprocates, the magnet 200 and the magnetic sensor 169 move along the guide shaft 164 while maintaining their relative positions. The magnetic sensor 169 includes a magnetic detection element 303 mounted on the substrate 301.

  On the other hand, on the surface of the guide shaft 164 facing the magnetic sensor 169, a large number of recesses 167 formed at regular intervals are formed. For this reason, the magnetic flux density of the magnetic field formed between the magnet 200 and the guide shaft 164 varies depending on whether the recess 167 is present or not. Therefore, when the carriage 161 moves, as shown in the figure, the output of the magnetic sensor 169 changes periodically, and the amount of movement of the carriage 161 can be known by counting the period of this change.

  Although a large concave portion 167 is drawn on the drawing for the purpose of clarifying the explanation, the magnetic sensor 169 can detect the concave portion 167 having a width and a depth of about several μm. Therefore, the detection accuracy required when controlling the movement amount of the carriage 161 in the ink jet recording apparatus 100 can be obtained. Therefore, in the ink jet recording apparatus 100, the movement amount of the carriage 161 can be controlled without adding a member for measuring the movement amount of the carriage 161, such as a linear scale or a linear encoder.

  FIG. 9 is a diagram for explaining another structure and operation of the magnetic sensor 169. As shown in the figure, the magnetic sensor 169 used here has two magnetic detection elements 303 and 305 mounted on one substrate 301. The distance between the magnetic detection elements 303 and 305 is selected such that the pulse signals appearing at the outputs of the magnetic detection elements 303 and 305 are shifted from each other by a quarter period due to the presence of the recess 167.

  With this structure, as shown in the figure, the combination of the outputs of the two magnetic detection elements 303 and 305 is “(0-0)> (1-0)> (1-1)> (0-1)”. "repeat. Therefore, for example, paying attention to the timing A at which (1-1) is output, if the subsequent output is (0-1), it can be seen that the carriage 161 is moving in the direction indicated by the arrow P in the figure. . If (1-0) is output following (1-1), it can be seen that the carriage 161 is moving in the direction indicated by the arrow Q in the figure. As described above, by using the magnetic sensor 169 including the plurality of magnetic detection elements 303 and 305 arranged at specific intervals, the movement direction as well as the movement amount of the carriage 161 can be detected.

  FIG. 10 is a diagram for explaining another shape and action of the guide shaft 164. As shown in the figure, the recess 167 formed in the guide shaft 164 used here has a sawtooth cross-sectional shape. For this reason, as shown in the figure, the output of the magnetic sensor 169 is also an asymmetric sawtooth wave. Therefore, the moving direction of the carriage 161 is detected from the direction of the output waveform of the magnetic sensor 169. As described above, by using the guide shaft 164 having the asymmetrical concave portion 167, the moving direction as well as the moving amount of the carriage 161 can be detected.

  FIG. 11 is a diagram schematically showing still another form of the guide shaft 164. As shown in the figure, the guide shaft 164 has a recess 167 having the same shape as the guide shaft 164 shown in FIGS. However, the recess 167 of the guide shaft 164 is filled with a filling member 168 made of a nonmagnetic material.

  Thereby, the external shape of the guide shaft 164 becomes smooth like the guide shaft 164 without the recess 167. However, the magnetic characteristics of the entire guide shaft 164 are the same as those of the guide shaft 164 shown in FIGS. Therefore, the movement amount of the carriage 161 can be detected using the magnetic sensor 169.

  Although the invention has been described using the embodiment, the technical scope of the invention is not limited to the scope described in the embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

1 is a perspective view illustrating an appearance of an ink jet recording apparatus 100. FIG. 2 is a perspective view showing an internal structure of the ink jet recording apparatus 100. FIG. 2 is a cross-sectional view showing an internal structure of the ink jet recording apparatus 100. FIG. 3 is a side view schematically showing a structure in the vicinity of a recording unit 160. FIG. It is a figure which shows typically the structure of the sliding member 166 vicinity. It is sectional drawing which shows a mode that the carriage 161 was cut horizontally by the ab line. It is a figure which shows typically the structure of the penetration part 163 vicinity. It is a figure which shows one form of the magnetic sensor 169. FIG. It is a figure explaining other structures and operation | movement of the magnetic sensor 169. FIG. It is a figure which shows the other form of the guide shaft 164 typically. It is a figure which shows typically the other form of the guide shaft 164. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Inkjet recording device, 41 Stacker main body, 42 Stacker extension part, 51 Hopper, 52 Feed roller, 53 Retard roller, 54 Paper return lever, 55 Conveyance roller, 56 Conveyance driven roller, 57 Discharge roller, 58 Discharge auxiliary roller, 59 discharge driven roller, 61 cartridge holder, 101 housing, 110 operation section, 120 memory card slot section, 130 feeding section, 132 paper support, 140 discharge section, 141 discharge port, 142 discharge tray, 143 handle, 150 transport section 151 Automatic paper feed mechanism, 152 transport mechanism, 153 paper discharge mechanism, 155 disk transport section, 160 recording section, 161 carriage, 162 recording head, 163 penetration section, 164 guide shaft, 165 carriage belt, 166 sliding member, 67 recess 168 filling member, 169 a magnetic sensor, 170 a platen, 180 frame, 200, 202 magnet, 210 York, 301 substrate, 303 and 305 magnetic sensor

Claims (9)

A transport unit for transporting a recording medium;
A guide member having ferromagnetic or paramagnetic properties and extending in a direction intersecting the direction in which the transport unit transports the recording medium;
A recording head for ejecting ink, a magnetic force source for generating a magnetic force for attracting the guide member, and a magnetic sensor for detecting a magnetic field generated by the magnetic force source are mounted, and while being biased toward the guide member, And a carriage that reciprocates along the guide member, and the recording medium is fed onto the track of the ink ejected by the recording head by the transport unit, thereby forming an image by attaching the ink to the surface of the recording medium. A recording device for
The guide member generates a periodic magnetic flux density distribution along the direction of reciprocal movement of the carriage based on the magnetic field lines from the magnetic source,
The magnetic sensor is a recording apparatus that detects a movement amount of the carriage by detecting a change in magnetic flux density distribution as the carriage moves.   The recording apparatus according to claim 1, wherein the magnetic force source is a permanent magnet.   The recording apparatus according to claim 1, wherein the magnetic force source and the magnetic sensor are disposed with the guide member interposed therebetween.   The recording apparatus according to claim 1, wherein the guide member has irregularities formed periodically along a direction of reciprocation of the carriage.   The recording apparatus according to claim 4, wherein the unevenness is formed in a region where a contact pressure between the carriage and the guide member is small on a surface where the carriage and the guide member face each other.   The recording apparatus according to claim 4, wherein the guide member includes a member that has a magnetic property different from that of the ferromagnetic material or the paramagnetic material forming the guide member and fills the concave portion of the unevenness.   The magnetic flux density distribution forms an asymmetric magnetic flux density distribution with respect to the direction of reciprocation of the carriage, and the direction of movement of the carriage is determined based on the fact that the magnetic field detected by the magnetic sensor changes as the carriage moves. The recording apparatus according to claim 1 for detection. The guide member forms a magnetic flux density distribution that is symmetric with respect to the direction of reciprocation of the carriage,
The magnetic sensor includes two or more magnetic detection elements arranged at intervals different from the period of the magnetic flux density distribution or an integer multiple of the period in the reciprocating direction of the carriage,
The recording apparatus according to claim 1, wherein the moving direction of the carriage is detected based on a change in a magnetic field detected by the magnetic sensor as the carriage moves. A transport unit for transporting a recording medium;
A guide member having ferromagnetic or paramagnetic properties and extending in a direction intersecting the direction in which the transport unit transports the recording medium;
A liquid ejecting head that ejects liquid, a magnetic force source that generates a magnetic force for attracting the guide member, and a magnetic sensor that detects a magnetic field generated by the magnetic force source are mounted and urged toward the guide member. And a carriage that reciprocates along the guide member, and the recording medium is fed onto the track of the liquid ejected by the liquid ejecting head by the transport unit so that the liquid adheres to the surface of the recording medium. A liquid ejecting apparatus for forming
The guide member generates a periodic magnetic flux density distribution along the direction of reciprocal movement of the carriage based on the magnetic field lines from the magnetic source,
The magnetic sensor is a liquid ejecting apparatus that detects a movement amount of the carriage by detecting a change in magnetic flux density distribution as the carriage moves.

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